<!DOCTYPE html>
<style>
#box {
  width: 90px;
  height: 90px;
  background-color: green;
  filter: drop-shadow(300px 100px 10px green);
}
#positioned {
  position: absolute;
  top: 100px;
  left: 100px;
  width: 50px;
  height: 50px;
  background-color: blue;
}
</style>
<!--
Tests paint invalidation of positioned object when its ancestor changes filter.
Passes if the all drop shadows change to green.
-->
<div id="box">
  <div id="positioned"></div>
</div>
